css_ast/rules/
supports.rs

1use super::prelude::*;
2use crate::selector::ComplexSelector;
3
4///
5/// ```md
6/// <general-enclosed>
7///  │├─╮─ <function-token> ─╭─╮─ <any-value> ─╭─ ")" ─┤│
8///     ╰─ "(" ──────────────╯ ╰───────────────╯
9///
10///
11/// <supports-in-parens>
12///  │├─╮─ "(" ─ <supports-condition> ─ ")" ─╭──┤│
13///     ├─────── <supports-feature> ─────────┤
14///     ╰─────── <general-enclosed> ─────────╯
15///
16/// <supports-feature>
17///  │├─ <supports-decl> ──┤│
18///
19/// <supports-feature>
20///  │├─ "(" ─ <declaration> ─ ")" ─┤│
21///
22///
23/// <container-condition> = [ <container-name>? <container-query>? ]!
24/// <container-name> = <custom-ident>
25/// <container-query> = not <query-in-parens>
26///                   | <query-in-parens> [ [ and <query-in-parens> ]* | [ or <query-in-parens> ]* ]
27/// <query-in-parens> = ( <container-query> )
28///                   | ( <size-feature> )
29///                   | style( <style-query> )
30///                   | scroll-state( <scroll-state-query> )
31///                   | <general-enclosed>
32///
33/// <https://drafts.csswg.org/css-conditional-3/#at-supports>
34/// <https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports>
35#[derive(Parse, Peek, ToSpan, ToCursors, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
36#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
37#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
38#[cfg_attr(feature = "css_feature_data", derive(::csskit_derives::ToCSSFeature), css_feature("css.at-rules.property"))]
39#[derive(csskit_derives::NodeWithMetadata)]
40#[metadata(node_kinds = AtRule, used_at_rules = Supports)]
41pub struct SupportsRule<'a> {
42	#[cfg_attr(feature = "visitable", visit(skip))]
43	#[atom(CssAtomSet::Supports)]
44	pub name: T![AtKeyword],
45	pub prelude: SupportsCondition<'a>,
46	#[metadata(delegate)]
47	pub block: SupportsRuleBlock<'a>,
48}
49
50#[derive(Parse, Peek, ToSpan, ToCursors, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
51#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable))]
52#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
53#[derive(csskit_derives::NodeWithMetadata)]
54pub struct SupportsRuleBlock<'a>(#[metadata(delegate)] pub RuleList<'a, Rule<'a>, CssMetadata>);
55
56#[derive(Peek, ToSpan, ToCursors, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
57#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
58#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
59#[derive(csskit_derives::NodeWithMetadata)]
60pub enum SupportsCondition<'a> {
61	Is(SupportsFeature<'a>),
62	Not(#[atom(CssAtomSet::Not)] T![Ident], SupportsFeature<'a>),
63	And(Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>),
64	Or(Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>),
65}
66
67impl<'a> FeatureConditionList<'a> for SupportsCondition<'a> {
68	type FeatureCondition = SupportsFeature<'a>;
69	fn keyword_is_not<I>(p: &Parser<'a, I>, c: Cursor) -> bool
70	where
71		I: Iterator<Item = Cursor> + Clone,
72	{
73		p.equals_atom(c, &CssAtomSet::Not)
74	}
75	fn keyword_is_and<I>(p: &Parser<'a, I>, c: Cursor) -> bool
76	where
77		I: Iterator<Item = Cursor> + Clone,
78	{
79		p.equals_atom(c, &CssAtomSet::And)
80	}
81	fn keyword_is_or<I>(p: &Parser<'a, I>, c: Cursor) -> bool
82	where
83		I: Iterator<Item = Cursor> + Clone,
84	{
85		p.equals_atom(c, &CssAtomSet::Or)
86	}
87	fn build_is(feature: SupportsFeature<'a>) -> Self {
88		Self::Is(feature)
89	}
90	fn build_not(keyword: T![Ident], feature: SupportsFeature<'a>) -> Self {
91		Self::Not(keyword, feature)
92	}
93	fn build_and(feature: Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>) -> Self {
94		Self::And(feature)
95	}
96	fn build_or(feature: Vec<'a, (SupportsFeature<'a>, Option<T![Ident]>)>) -> Self {
97		Self::Or(feature)
98	}
99}
100
101impl<'a> Parse<'a> for SupportsCondition<'a> {
102	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
103	where
104		I: Iterator<Item = Cursor> + Clone,
105	{
106		if p.peek::<T![Function]>() || p.peek::<T!['(']>() {
107			return Ok(Self::Is(p.parse::<SupportsFeature>()?));
108		}
109		Self::parse_condition(p)
110	}
111}
112
113#[allow(clippy::large_enum_variant)] // TODO: Box?
114#[derive(ToCursors, ToSpan, SemanticEq, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
115#[cfg_attr(feature = "serde", derive(serde::Serialize), serde())]
116#[cfg_attr(feature = "visitable", derive(csskit_derives::Visitable), visit)]
117#[derive(csskit_derives::NodeWithMetadata)]
118pub enum SupportsFeature<'a> {
119	FontTech(
120		#[cfg_attr(feature = "visitable", visit(skip))] Option<T!['(']>,
121		#[cfg_attr(feature = "visitable", visit(skip))] T![Function],
122		ComponentValues<'a>,
123		#[cfg_attr(feature = "visitable", visit(skip))] T![')'],
124		#[cfg_attr(feature = "visitable", visit(skip))] Option<T![')']>,
125	),
126	FontFormat(
127		#[cfg_attr(feature = "visitable", visit(skip))] Option<T!['(']>,
128		#[cfg_attr(feature = "visitable", visit(skip))] T![Function],
129		ComponentValues<'a>,
130		#[cfg_attr(feature = "visitable", visit(skip))] T![')'],
131		#[cfg_attr(feature = "visitable", visit(skip))] Option<T![')']>,
132	),
133	Selector(
134		#[cfg_attr(feature = "visitable", visit(skip))] Option<T!['(']>,
135		#[cfg_attr(feature = "visitable", visit(skip))] T![Function],
136		ComplexSelector<'a>,
137		#[cfg_attr(feature = "visitable", visit(skip))] T![')'],
138		#[cfg_attr(feature = "visitable", visit(skip))] Option<T![')']>,
139	),
140	Property(
141		#[cfg_attr(feature = "visitable", visit(skip))] T!['('],
142		Declaration<'a, StyleValue<'a>, CssMetadata>,
143		#[cfg_attr(feature = "visitable", visit(skip))] Option<T![')']>,
144	),
145}
146
147impl<'a> Peek<'a> for SupportsFeature<'a> {
148	fn peek<I>(p: &Parser<'a, I>, c: Cursor) -> bool
149	where
150		I: Iterator<Item = Cursor> + Clone,
151	{
152		let c2 = p.peek_n(2);
153		if <T!['(']>::peek(p, c) {
154			(<T![Function]>::peek(p, c2)
155				&& matches!(
156					p.to_atom::<CssAtomSet>(c2),
157					CssAtomSet::Selector | CssAtomSet::FontTech | CssAtomSet::FontFormat
158				)) || <Declaration<'a, StyleValue<'a>, CssMetadata>>::peek(p, c2)
159		} else {
160			(<T![Function]>::peek(p, c)
161				&& matches!(
162					p.to_atom::<CssAtomSet>(c),
163					CssAtomSet::Selector | CssAtomSet::FontTech | CssAtomSet::FontFormat
164				)) || <Declaration<'a, StyleValue<'a>, CssMetadata>>::peek(p, c)
165		}
166	}
167}
168impl<'a> Parse<'a> for SupportsFeature<'a> {
169	fn parse<I>(p: &mut Parser<'a, I>) -> ParserResult<Self>
170	where
171		I: Iterator<Item = Cursor> + Clone,
172	{
173		let open = p.parse_if_peek::<T!['(']>()?;
174		if p.peek::<T![Function]>() {
175			let function = p.parse::<T![Function]>()?;
176			match p.to_atom::<CssAtomSet>(function.into()) {
177				CssAtomSet::Selector => {
178					let selector = p.parse::<ComplexSelector>()?;
179					// End function
180					let close = p.parse::<T![')']>()?;
181					let open_close = if open.is_some() { Some(p.parse::<T![')']>()?) } else { None };
182					Ok(Self::Selector(open, function, selector, close, open_close))
183				}
184				CssAtomSet::FontTech => {
185					todo!();
186				}
187				CssAtomSet::FontFormat => {
188					todo!();
189				}
190				_ => Err(Diagnostic::new(p.next(), Diagnostic::unexpected_function))?,
191			}
192		} else if let Some(open) = open {
193			let property = p.parse::<Declaration<'a, StyleValue<'a>, CssMetadata>>()?;
194			let close = p.parse_if_peek::<T![')']>()?;
195			Ok(Self::Property(open, property, close))
196		} else {
197			Err(Diagnostic::new(p.next(), Diagnostic::unexpected))?
198		}
199	}
200}
201
202#[cfg(test)]
203mod tests {
204	use super::*;
205	use crate::CssAtomSet;
206	use css_parse::assert_parse;
207
208	#[test]
209	fn size_test() {
210		assert_eq!(std::mem::size_of::<SupportsRule>(), 656);
211		assert_eq!(std::mem::size_of::<SupportsCondition>(), 536);
212		assert_eq!(std::mem::size_of::<SupportsRuleBlock>(), 96);
213	}
214
215	#[test]
216	fn test_writes() {
217		assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(color:black){}");
218		assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width:1px){body{width:1px}}");
219		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not (width:1--foo){}");
220		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width: 1--foo) or (width: 1foo) {\n\n}");
221		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width: 1--foo) and (width: 1foo) {\n\n}");
222		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(width: 100vw) {\n\tbody {\n\t\twidth: 100vw;\n\t}\n}");
223		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not ((text-align-last: justify) or (-moz-text-align-last: justify)) {\n\n}");
224		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports((position:-webkit-sticky)or (position:sticky)) {}");
225		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports selector(h2 > p) {\n\n}");
226		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports(selector(h2 > p)) {}", "@supports selector(h2 > p) {\n\n}");
227		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not selector(h2 > p) {\n\n}");
228		// assert_parse!(CssAtomSet::ATOMS, SupportsRule, "@supports not (selector(h2 > p)) {}", "@supports not selector(h2 > p) {\n\n}");
229	}
230}
css_ast/rules/supports.rs

css_ast/rules/
supports.rs
